summaryrefslogtreecommitdiffstats
path: root/drivers/usb/usbip/vhci_tx.c
blob: 409fd99f3257f94bb7489b0d7aa7d971bf5e303b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
/*
 * Copyright (C) 2003-2008 Takahiro Hirofuchi
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 * USA.
 */

#include <linux/kthread.h>
#include <linux/slab.h>

#include "usbip_common.h"
#include "vhci.h"

static void setup_cmd_submit_pdu(struct usbip_header *pdup,  struct urb *urb)
{
	struct vhci_priv *priv = ((struct vhci_priv *)urb->hcpriv);
	struct vhci_device *vdev = priv->vdev;

	usbip_dbg_vhci_tx("URB, local devnum %u, remote devid %u\n",
			  usb_pipedevice(urb->pipe), vdev->devid);

	pdup->base.command   = USBIP_CMD_SUBMIT;
	pdup->base.seqnum    = priv->seqnum;
	pdup->base.devid     = vdev->devid;
	pdup->base.direction = usb_pipein(urb->pipe) ?
		USBIP_DIR_IN : USBIP_DIR_OUT;
	pdup->base.ep	     = usb_pipeendpoint(urb->pipe);

	usbip_pack_pdu(pdup, urb, USBIP_CMD_SUBMIT, 1);

	if (urb->setup_packet)
		memcpy(pdup->u.cmd_submit.setup, urb->setup_packet, 8);
}

static struct vhci_priv *dequeue_from_priv_tx(struct vhci_device *vdev)
{
	struct vhci_priv *priv, *tmp;

	spin_lock(&vdev->priv_lock);

	list_for_each_entry_safe(priv, tmp, &vdev->priv_tx, list) {
		list_move_tail(&priv->list, &vdev->priv_rx);
		spin_unlock(&vdev->priv_lock);
		return priv;
	}

	spin_unlock(&vdev->priv_lock);

	return NULL;
}

static int vhci_send_cmd_submit(struct vhci_device *vdev)
{
	struct vhci_priv *priv = NULL;

	struct msghdr msg;
	struct kvec iov[3];
	size_t txsize;

	size_t total_size = 0;

	while ((priv = dequeue_from_priv_tx(vdev)) != NULL) {
		int ret;
		struct urb *urb = priv->urb;
		struct usbip_header pdu_header;
		struct usbip_iso_packet_descriptor *iso_buffer = NULL;

		txsize = 0;
		memset(&pdu_header, 0, sizeof(pdu_header));
		memset(&msg, 0, sizeof(msg));
		memset(&iov, 0, sizeof(iov));

		usbip_dbg_vhci_tx("setup txdata urb %p\n", urb);

		/* 1. setup usbip_header */
		setup_cmd_submit_pdu(&pdu_header, urb);
		usbip_header_correct_endian(&pdu_header, 1);

		iov[0].iov_base = &pdu_header;
		iov[0].iov_len  = sizeof(pdu_header);
		txsize += sizeof(pdu_header);

		/* 2. setup transfer buffer */
		if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) {
			iov[1].iov_base = urb->transfer_buffer;
			iov[1].iov_len  = urb->transfer_buffer_length;
			txsize += urb->transfer_buffer_length;
		}

		/* 3. setup iso_packet_descriptor */
		if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
			ssize_t len = 0;

			iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
			if (!iso_buffer) {
				usbip_event_add(&vdev->ud,
						SDEV_EVENT_ERROR_MALLOC);
				return -1;
			}

			iov[2].iov_base = iso_buffer;
			iov[2].iov_len  = len;
			txsize += len;
		}

		ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 3, txsize);
		if (ret != txsize) {
			pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
			       txsize);
			kfree(iso_buffer);
			usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
			return -1;
		}

		kfree(iso_buffer);
		usbip_dbg_vhci_tx("send txdata\n");

		total_size += txsize;
	}

	return total_size;
}

static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev)
{
	struct vhci_unlink *unlink, *tmp;

	spin_lock(&vdev->priv_lock);

	list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
		list_move_tail(&unlink->list, &vdev->unlink_rx);
		spin_unlock(&vdev->priv_lock);
		return unlink;
	}

	spin_unlock(&vdev->priv_lock);

	return NULL;
}

static int vhci_send_cmd_unlink(struct vhci_device *vdev)
{
	struct vhci_unlink *unlink = NULL;

	struct msghdr msg;
	struct kvec iov[3];
	size_t txsize;

	size_t total_size = 0;

	while ((unlink = dequeue_from_unlink_tx(vdev)) != NULL) {
		int ret;
		struct usbip_header pdu_header;

		txsize = 0;
		memset(&pdu_header, 0, sizeof(pdu_header));
		memset(&msg, 0, sizeof(msg));
		memset(&iov, 0, sizeof(iov));

		usbip_dbg_vhci_tx("setup cmd unlink, %lu\n", unlink->seqnum);

		/* 1. setup usbip_header */
		pdu_header.base.command = USBIP_CMD_UNLINK;
		pdu_header.base.seqnum  = unlink->seqnum;
		pdu_header.base.devid	= vdev->devid;
		pdu_header.base.ep	= 0;
		pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum;

		usbip_header_correct_endian(&pdu_header, 1);

		iov[0].iov_base = &pdu_header;
		iov[0].iov_len  = sizeof(pdu_header);
		txsize += sizeof(pdu_header);

		ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 1, txsize);
		if (ret != txsize) {
			pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
			       txsize);
			usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
			return -1;
		}

		usbip_dbg_vhci_tx("send txdata\n");

		total_size += txsize;
	}

	return total_size;
}

int vhci_tx_loop(void *data)
{
	struct usbip_device *ud = data;
	struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);

	while (!kthread_should_stop()) {
		if (vhci_send_cmd_submit(vdev) < 0)
			break;

		if (vhci_send_cmd_unlink(vdev) < 0)
			break;

		wait_event_interruptible(vdev->waitq_tx,
					 (!list_empty(&vdev->priv_tx) ||
					  !list_empty(&vdev->unlink_tx) ||
					  kthread_should_stop()));

		usbip_dbg_vhci_tx("pending urbs ?, now wake up\n");
	}

	return 0;
}
OpenPOWER on IntegriCloud